Coordination geometry trigonal prism

Figure 11.1. Schematic representation of typical silver (central atom) coordination environments with different coordination numbers and geometries (a) linear two-coordinate (b) triangular three-coordinate (c) T-shaped three-coordinate (d) square planar four-coordinate (e) tetrahedral four-coordinate (f) trigonal bipyramidal five-coordinate (g) tetragonal pyramidal five-coordinate (h) octahedral six-coordinate (i) trigonal prism six-coordinate (j) seven-coordinate (k) tetragonal prism eight-coordinate.

As is common with the higher coordination geometries, the interconversion of Dzh Cav niay be easily achieved. The monocapped square antiprism (C4 ) can be generated from the s-tricapped trigonal prism by raising the points a and b (Fig. 27) and lowering the two caps c and d so that the four form the basal plane of the square antiprism. 

It is clear then that the coordination number in both cases is 9 = 6 (trigonal prism) + 3 (caps) that in each case it is really 7 + 2 (cf. bond lengths) and that not only is the topology the same but the geometry almost identical too . P-K2SO4 is one of many compounds and structure types that may be accurately described as anion-stuffed C23 or C37. 

A by-product of the preparation of U(Et2NC02)4 from the tetrachloride and the amine is a product of composition U402(Et2NC02)i2 this is a tetramer in which there are two non-equivalent uranium(lV) sites. In one of them the coordination geometry is a distorted tricapped trigonal prism, and the geometry of the other does not fit any type of regular polyhedron.1 5... 

The geometry of the nine-coordinate thorium atom in the thenoyltrifluoroacetonate complex, [Th CF3COCHCO-(2-C4H3S) 4 (n-CsHi7)3PO ], is a 4,4,4-tricapped trigonal prism (Figure 7).124... 

For each of the two important nine-coordinate geometries, a trigonal prism centered on all rectangular faces (D3/,) and a square antiprism... 

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